CN102112028A - Rotatably driven cutting knife, production method, and kitchen appliance - Google Patents

Abstract

The invention relates to a rotatably driven cutting knife (7) for a kitchen appliance (1), in particular for a blender (2), having at least one first support arm (10) provided with a cutting edge (14). According to the invention, it is proposed that the cutting edge ( 14 ) is formed at least partially by a sharpened edge ( 18 ) of a semi-finished product ( 17 ) for producing the cutting knife ( 7 ). Preferably two first support arms ( 10 ) are provided, each of which is of angular design and each has a radially inner side and a radially outer side equipped with a cutting edge ( 14 ). Furthermore, the cutting knife (7) advantageously has a second support arm (15) which extends from the center of the cutting knife (7) opposite one another and with respect to the first support arm ( 10 ) is arranged rotatably on the cutting knife ( 7 ). Furthermore, the invention relates to a method for producing a cutting knife (7) and a kitchen appliance (1), in particular a blender, provided with said cutting knife (7), in which method the knife is sharpened At least one edge (18) of the semi-finished product (17) and the cutting knife (7) is subsequently separated from the semi-finished product (17) such that the relevant edge (18) of the semi-finished product (17) forms a The blade (14) of the cutting knife (7). By using the invention, a rotatably driven cutting knife ( 7 ) of high quality can be produced in a particularly rational manner.

Description

Rotatable cutting knife, manufacturing method and kitchen utensil

technical field

The invention relates to a rotatably driven cutting knife for a kitchen appliance, in particular for a blender, having at least one first support arm provided with a cutting edge. Furthermore, the invention relates to a method for producing such a cutting knife and a kitchen appliance equipped with such a cutting knife.

Background technique

A rotary cutting knife of the type mentioned at the outset and a method for producing it are known from German publication DE 195 03 491 A1.

The cutting knife comprises a central part which can be positively connected to the drive shaft of the kitchen appliance, from which two supporting arms pointing diametrically opposite to each other extend radially outwards. At its outer end, each of the support arms has an angular configuration with a long side and a short side, the sides being ground into a knife-like shape. Furthermore, in the region of the edges, the cutting blade is also provided with a three-dimensional rolling section, so that mutually opposite cutting edges run in different planes.

During the production of the aforementioned cutting blades, a blank is first punched out of a thin, corrosion-resistant high-grade steel sheet. In this case, a three-dimensional rolled part can also be produced in the region of the cutting edge in one working step. Subsequently, the region of the edge provided as the cutting edge is ground in a separate process.

This procedure is in principle very suitable for the manufacture of cutting knives. However, the subsequent grinding process of the blank that has been punched out of the semi-finished product requires relatively complex operations and prolongs the production time.

Furthermore, it is known from other applications to form the cutting edge by grinding the edges of the semi-finished product before separating the individual cutting blades.

For example, in the patent document DE 37 34 641 C1, a method for making a paring knife for peeling vegetables or similar items is disclosed, wherein the strip sharpened on both sides is periodically fed into the processing device. In the processing device, the separating grooves and their intermediate regions are first punched out for the subsequent separation of the individual paring knives. The outer sharpened edges of the semi-finished product prepared in this way are then over-bent inwards and the bridging sections are bent after the paring knife has been separated.

In patent documents GB 258,142, GB 282,478 and US 1,486,317 there are described manufacturing methods for razors in which the strip is first partially punched out without separating the individual blades. The remaining longitudinal edges of the strip are then ground and the blades are then separated therefrom.

None of said documents disclose technical principles that can be directly applied to rotatably driven cutting knives, since they differ significantly in function and shape from paring knives and razors.

Contents of the invention

The object of the invention is to produce a high-quality cutting knife of the type described in a particularly rational manner.

The object of the invention is achieved in a rotatably driven cutting knife of the type mentioned at the outset in that the cutting edge is formed by a sharpened edge of the semi-finished product used to produce the cutting knife. In a method of the type described, this object is solved in that at least one edge of the semi-finished product is sharpened in a knife-like manner and the cutting knife is subsequently separated from the semi-finished product so that the relevant edge of the semi-finished product forms the cutting edge of the cutting knife. .

This embodiment and this approach considerably simplifies the production of the rotatably driven cutting knife, since the sharpening of the cutting edge takes place at a point in time when the cutting knife has not yet been separated from the semi-finished product. Thereby, there is no need to manipulate a large number of parts during the sharpening process. Rather, sharpening can also be carried out on a semi-finished product comprising a plurality of cutting knives. Furthermore, the quality of the cutting edge is significantly improved by the continuous material supply, since the orientation of the edges involved relative to the tool used for sharpening is significantly simplified. If desired, heat treatment can also be incorporated in the process without any problems. The particularly precisely manufactured blades are especially used for chopping processed items.

In principle, further processing of the semi-finished product can take place before sharpening the edges. However, it is particularly advantageous if the edges are machined beforehand, that is to say already on the provided semi-finished product or as a first machining step in the production of the cutting blade.

Advantageous configurations or refinements which can be used individually or in combination with one another are the subject matter of the subclaims.

The cutting edge is advantageously straight at least partially, but preferably over its entire length, so that the processing of the semi-finished product that is also provided with a straight-running edge is particularly simple and/or it is no longer required after the fact. Deformation of sharp edges. The separation of the cutting knives from the semi-finished product can in principle be carried out by any suitable method, for example also by laser beam cutting or water jet cutting. However, since cutting knives according to the invention are usually produced in large quantities, the separation process is carried out with particular advantage by punching the cutting knives.

According to a particularly preferred configuration of the invention, the cutting knife has two or more first support arms provided with such cutting edges, which first support arms extend from the center of the cutting knife. Particularly preferred are two supporting arms extending from the center of the cutting blade opposite one another. This arrangement is proven particularly when using high-speed rotating stirrers due to the largely unbalanced operation. In this case, the first support arms are preferably angular and each have a radially inner side and a radially outer side, wherein each support arm advantageously has a short side on the radially inner side and a radially outer side. Features long sides. The radially outer edge of the inner leg and the outer leg encloses, for example, an angle α of 90° to 130°, in particular approximately 110°. The sharpened edge of the cutting edge preferably has a thickness of less than 0.2 mm, particularly preferably of less than 0.15 mm, particularly preferably of 0.1 mm or less.

The cutting edge is preferably formed on the radially outer edge, the arrangement being arranged such that the region of the outer edge penetrating into the workpiece is sharpened when the cutting knife is rotated. In particular, the edges can be formed by pre-sharpened edges of the semi-finished product running parallel to one another and are likewise parallel to one another as long as they are not deformed in the subsequent production process. At the same time, the parallel-running edges of the semi-finished product can be sharpened with mutually opposite tools, so that on the one hand the space requirement of the device required for this is particularly small, and on the other hand at least partially compensating for the effect on the semi-finished product. on the force.

According to a further preferred embodiment of the invention, the cutting knife has at least one, preferably two or more second support arms. Particularly preferred are two second support arms extending from the center of the cutting knife opposite one another and arranged on the cutting knife at an angular offset relative to the first support arm. The second support arm encloses an angle β of, for example, 80° to 100°, in particular approximately 90°, with the inner edge of the first support arm. Said region, in which the cutting knife is arranged, is used in particular for chopping up the processed goods.

In this case, in order to simplify the production process, the second support arm preferably extends substantially linearly, wherein in order to reduce the torque required when using the cutting knife, the radial extension of the second support arm is preferably smaller than that of the first support arm. The radial extension of the arm.

The second support arm is particularly advantageously equipped with a cutting edge, which is preferably formed by plastic deformation. The invention achieves that the cutting edge is not ground, preferably even clamping for forming the cutting edge can be dispensed with. With this embodiment of the invention, lower demands can be placed on the sharpness of the cutting edge than on the quality of the cutting edge described above. In particular, the cutting edge can be formed by plastic deformation of the material when the cutting knife is separated from the semi-finished product. The cutting edge preferably has a thickness of greater than 0.1 mm, particularly preferably greater than 0.15 mm, particularly preferably greater than 0.2 mm, for example between 0.2 and 0.25 mm.

According to a further advantageous embodiment of the invention, the second support arm is preferably arranged obliquely with respect to the main plane of the cutting knife formed by the first support arm for a particularly advantageous configuration of the performance of the cutting knife with respect to chopping the processed goods , that is, the second support arm protrudes from the main plane. With this refinement of the invention it is achieved that the second support arm grasps and chops the processed product separated by the cutting edge of the first support arm.

This can be achieved when one of the second support arms is inclined downwards relative to the main plane and the second opposite support arm is inclined upwards relative to the main plane, for example at an angle of 15° to 25°, in particular approximately 20°. particularly effectively achieved. As a result, a chopping action takes place above and below the main plane of the cutting knife. The directions refer to the normal horizontal use position of the cutting knife.

The method according to the invention can be carried out particularly easily and cost-effectively when a planar semi-finished product, for example a corrosion-resistant high-grade steel sheet having a thickness of 0.6 mm to 1.0 mm, in particular approximately 0.75 mm, is used for the production of the cutting blade. In this case, the semi-finished product is particularly advantageously configured in the form of a strip and can thus be provided in the form of a coil (coil). During the production of the cutting blade, the strip can be continuously drawn from the roll. In this case, at least one edge extending longitudinally of the strip, preferably two mutually opposite edges, of the semi-finished product is preferably sharpened in a knife-like manner before the cutting knife is separated, wherein the width of the strip can correspond to the width of the first support The distance between the blades extending parallel to each other on the arm.

The knife-like sharpening is preferably achieved by grinding the edges of the semi-finished product, since this produces a particularly high quality of the knife edge. In principle, however, sharpening can also be carried out by other methods, for example by plastic forming of the edges in roll sets through which the semi-finished product is passed continuously.

The cutting knives are preferably separated from the semi-finished product by a stamping process, wherein at the same time rolling can be partially performed by means of a correspondingly configured stamping tool. By means of this rolling, for example, a cutting edge can be formed on the second support arm of the cutting tool.

Description of drawings

The invention is explained in more detail below on the basis of schematic diagrams in an exemplary embodiment with further details.

The accompanying drawings show:

Fig. 1 is the perspective view that is equipped with the kitchen utensil of cutting knife according to the present invention with agitator as example;

Figure 2 is a side view (Figure 2a) and a top view of a cutting knife constructed according to the invention;

Fig. 3 is the perspective view of cutting knife according to Fig. 2;

FIG. 4 shows the different method stages of the application of the method according to the invention.

Detailed ways

The kitchen appliance 1 shown in FIG. 1 in the form of a mixer 2 comprises an electric drive, an operating element 3 and a housing 4 which preferably accommodates an accumulator, to which a tool 5 is detachably coupled. On its end facing away from the housing 4 , the tool 5 is provided with a bell-shaped tool head 6 into which a cutting blade 7 is inserted. The cutting blade 7 is non-rotatably connected to the electric drive of the stirrer 2 by means of a drive shaft arranged in the tool 5 and a coupling device in the transition region between the tool 5 and the housing 4 and can be driven by it. The device is placed in rotation about the axis 8 in the direction of the arrow A.

As can be seen from FIGS. 2 and 3 , the cutting blade 7 has a central square socket 9 for the drive shaft of the tool 5 . Two first support arms 10 extend opposite each other from a socket 9 forming the center of the cutting knife. The support arms 10 of congruent design are angular and form a Z-shaped arrangement relative to one another. The support arms each comprise an inner radially outwardly facing leg 11 and an outer leg 12 , the radially outer edge 13 of which encloses an angle α of approximately 110° with the inner leg 11 .

The rectilinear edges 13 of the two outer sides 12 run parallel to one another and form cutting edges 14 whose distance D is approximately 24 mm in the exemplary embodiment. The radially outer sides 12 each have a length L of approximately 18 mm and are therefore significantly longer than the radially inner sides 11 . As can be seen from FIG. 3 , the cutting edge 14 consists of a simple chamfer of the edge 13 and is arranged such that it cuts through the workpiece when the cutting knife 7 is rotated in the direction of the arrow A. As shown in FIG.

Furthermore, the cutting blade 7 is provided with a pair of second support arms 15 extending radially outwards from the center of the cutting blade 7 . The second support arms 15 enclose an angle β of 90° with the inner side 11 and are each equipped with a cutting edge 16 which, when the cutting knife 7 is rotated in the direction of the arrow A, penetrates into the workpiece . As can be seen from FIG. 2a, the second support arm 15 is arranged obliquely at an angle x of approximately 20° with respect to the main plane of the cutting blade 7 formed by the first support arm 10, wherein in the second support arm 15 One of the support arms 15 is inclined downwards with respect to the main plane and the opposite second support arm 15 is inclined upwards with respect to the main plane. The radial extension of the second support arm 15 in the present embodiment corresponds approximately to half the radial extension of the first support arm 10 . Since the cutting edge 16 is mainly used for chopping the processed goods, it does not have to have the same sharpness as the knife edge 14 . When producing the cutting knife 7 according to the invention, the strip-shaped semi-finished product 17 shown in FIG. 4 a is first sharpened on its longitudinally extending edge 18 by grinding, thereby forming the cutting edge 14 ( FIG. 4 b ). In the exemplary embodiment, the semi-finished product 17 is produced from high-grade steel sheet with a thickness of 0.75 mm and has a width B which corresponds to the distance D of the cutting blades 7 to be produced.

As can be seen from FIG. 4 c , the cutting blade 7 is subsequently separated from the semi-finished product 17 by punching such that the edge 18 of the semi-finished product 17 provided with the cutting edge 14 forms the edge 13 of the first support arm 10 of the cutting blade 7 . Furthermore, the second support arm 15 is bent relative to the main plane during stamping and is provided with a cutting edge 16 by rolling. Due to the substantially Z-shaped configuration of the cutting blade 7 only small stamping residues 19 which have been separated from one another are produced, which can be collected without problems and fed to the recycling device.

The features disclosed in the preceding description, the claims and the drawings can be significant not only individually but also in any combination for realizing the invention in different embodiments.

List of reference signs:

1 kitchen utensils

2 Stirrers

3 Operating elements

4 Shell

5 tools

6 tool head

7 Cutting knife

8 axis

9 sockets

10 (first) support arm

11 Edge (radial inner)

12 Sides (radial outside)

13 (edge 12) edge

14 blade

15 (second) support arm

16 cutting edge

17 semi-finished products

18 (semi-finished) edge

19 Stamping surplus material

A Arrow (rotation direction of cutting knife 7)

B (strip semi-finished product) width

D (distance between edges 13)

L (outside side 12) length

α (between inner side 11 and edge 13) angle

β (between inner edge 11 and support arm 15) angle

χ (inclination of the support arm 15 relative to the main plane) angle

Claims (22)

1. be used for the cutter (7) of kitchen utensils (1) in particular for the rotatable driving of agitator (2), has first support arm (10) that at least one is provided with blade (14), it is characterized in that described blade (14) is formed by the sharp seamed edge (18) of the mill of the semi-finished product that are used to make described cutter (7) (17).

2. by the described cutter of claim 1, it is characterized in that described blade (14) is configured to rectilinear at least partly.

3. by claim 1 or 2 described cutter, it is characterized in that, from described semi-finished product (17), pass through the described cutter of stamped (7).

4. by each described cutter in the claim 1 to 3, it is characterized in that, described cutter (7) have at least two first support arms (10) that are provided with described blade (14), and described first support arm extends out from the center of described cutter (7) opposed to each other.

5. by the described cutter of claim 4, it is characterized in that described first support arm (10) is configured to the limit (12) of limit horn shape and that have inner radial respectively (11) and radially outer.

6. by the described cutter of claim 5, it is characterized in that each support arm (10) has minor face (11) and has long limit (12) at radially outer in inner radial.

7. by claim 5 or 6 described cutter, it is characterized in that described blade (14) is gone up structure on the limit (12) of radially outer.

8. by each described cutter in the claim 4 to 7, it is characterized in that, described cutter (7) have second support arm (15), and described second support arm extends out and is arranged on the described cutter (7) with an angle with respect to described first support arm (10) with staggering from the center of described cutter (7) opposed to each other.

9. by the described cutter of claim 8, it is characterized in that described second support arm (15) substantial linear ground extends.

10. by claim 8 or 9 described cutter, it is characterized in that the radially development length of described second support arm (15) is less than the radially development length of described first support arm (10).

11., it is characterized in that described second support arm (15) is equipped with cutting seamed edge (16) by each described cutter in the claim 8 to 10, described cutting seamed edge forms by plastic deformation.

12., it is characterized in that described second support arm (15) is arranged obliquely with respect to the principal plane that is formed by described first support arm (10) of described cutter (7) by each described cutter in the claim 8 to 11.

13., it is characterized in that downward-sloping and opposed second support arm (15) is inclined upwardly with respect to described principal plane one of described second support arm (15) with respect to described principal plane by the described cutter of claim 12.

14. be used for making method by the cutter of each described rotatable driving of aforesaid right requirement, it is characterized in that, cutter shape ground grinds at least one seamed edge (18) of sharp semi-finished product (17) and tell described cutter (7) subsequently from described semi-finished product (17), makes the related seamed edge (18) of described semi-finished product (17) constitute the blade (14) of described cutter (7).

15. by the described method of claim 14, it is characterized in that, use planar semi-finished product (17) in order to make described cutter (7).

16. by the described method of claim 15, it is characterized in that, construct described semi-finished product (17) bandedly.

17., it is characterized in that the mutual opposed seamed edge (18) of the cutter shape ground sharp described semi-finished product of mill (17) by the described method of claim 16 along the band longitudinal extension.

18., it is characterized in that the mill that produces the cutter shape by the seamed edge (18) that grinds described semi-finished product (17) is sharp by each described method in the claim 14 to 17.

19. by each described method in the claim 14 to 18, it is characterized in that, from described semi-finished product (17), tell described cutter (7) by punching press.

20., it is characterized in that described cutter of roll extrusion (17) at least partly when from described semi-finished product (17), telling by each described method in the claim 14 to 19.

21. by the described method of claim 20, it is characterized in that, when the described semi-finished product of roll extrusion (17), produce cutting seamed edge (16).

22. kitchen utensils (1), especially agitator (2) have by each described cutter (7) in the claim 1 to 13 or the cutter (7) made under situation about using by each described method in the claim 14 to 21.

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